Opals

The pride of the peacock

Victoria Holt [i.e. E. Hibbert]

Asneha: the legend of the opal

illustrations and text by Carlo de Fornaro

Digit Dick and the lost opals

by Leslie Rees ; illustrated by Hutchings

Opals

text and photographs, Fred Ward ; editing, Charlotte Ward.

Uranium, thorium isotopic analyses and uranium-series ages of calcite and opal, and stable isotopic compositions of calcite from drill cores UE25a#1, USW G-2 and USW G-3/GU-3, Yucca Mountain, Nevada

by B.J. Szabo and T.K. Kyser ; prepared in cooperation with the Nevada Operation Office, U.S. Department of Energy (Interagency agreement DE-AI08-78ET44802)

Opal Identification & Value (Rocks, Minerals and Gemstones)

Paul B. Downing

Opals (Fred Ward Gem Book)

Fred Ward

Australian Opals in Colour

Ron Perry Nance Perry

Blagorodnye opaly: prirodnye i sinteticheskie

N.D. Deniskina, D.V. Kalinin, L.K. Kazant︠s︡eva ; otvet︠s︡vennyĭ redaktor, N.V. Sobolev

Opals

Eric Ethan